Visit Toronto

I am coming to Toronto as a part of my business trip. I will be there for a short period. Meanwhile, I would like to visit some places. I am planning to visit Lake Ontario, Royal Ontario museum, Algonquin park etc. So, if there are some more places to visit, please let me know. I don't want to waste this trip. We are coming as a group of four. So please suggest some furnished apartment rentals at Toronto. So that we can make both our stay and visit to this place a memorable one. Please reply if you have some suggestions. I will be grateful for it.